Related Experiment Video
Updated: Jul 4, 2026

Transradial Access Chemoembolization for Hepatocellular Carcinoma Patients
Published on: September 20, 2020
Ultrasound-guided radial artery catheterization and the modified Allen's test
Sharon R Wilson1, Itamar Grunstein, Elsa R Hirvela
1Department of Emergency Medicine, University of California Davis Medical Center, Davis, California, USA.
Abstract:
In this case report, ultrasound-guided radial artery catheterization and a modified Allen's test were performed by Emergency Department (ED) physicians to facilitate the management of an intubated, critically injured patient. Ultrasound was demonstrated to be a valuable tool in determining collateral circulation and guiding radial artery cannulation in a patient unable to cooperate with the traditional Allen's test. Ultrasound guidance may reduce the risk of radial artery catheterization in severely injured patients.
Related Concept Videos
Assessment of radial pulse
The radial pulse, located at the wrist, is often the preferred site for assessing peripheral pulse because of its accessibility and dependability. The process of determining the radial pulse involves several steps:
Peripheral Arterial Disease II: Clinical Manifestations and Diagnostic Evaluation
Assessment of apical radial pulse
The A-R pulse assessment involves simultaneous evaluation of the apical and radial pulses. When the apical and radial pulse rates vary, this assessment helps identify a pulse deficit.
Pre-Procedural Preparation
Cardiac Catheterization II: Right Heart Catheterization
Sites for measuring blood pressure
The Brachial Artery: Primary Site for Blood Pressure Measurement
Cardiac Catheterization I: Pre-Procedure Overview

